$\left(x\:+y\:+z\right)\left(x+y-z\right)$
$-66:\left(-11\right).5$
$x^{-2}\cdot x^3$
$a^2+18a+81$
$-42\cdot7$
$10g^{3\:}-20g+500g$
$15\int\frac{\ln\left(x\right)\sqrt[4]{1+3\ln^2\left(x\right)}}{x}dx$
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